If no creature card is imprinted on Duplicant, it has its normal power, toughness, and creature type.

6/8/2016

Duplicant’s base power and toughness change to the imprinted card’s power and toughness. Counters and other effects that modify Duplicant’s power and toughness still apply.

6/8/2016

Abilities that define a creature’s power and toughness apply while that card is in exile, but abilities that add or subtract from it don’t. For example, the ability of Battle Squadron applies to determine Duplicant’s power and toughness, but the ability of Werebear doesn’t. Duplicant’s power and toughness are constantly updated if the exiled card’s power and/or toughness change.

6/8/2016

Duplicant keeps all creature types it had when the card was imprinted, including any types that Duplicant had gained.

4/17/2020

If a melded permanent or a merged permanent is exiled by Duplicant’s triggered ability, that ability’s controller chooses the relative timestamp of the exiled cards. Duplicant looks at the information of the one with the later timestamp.